SQL

 

What is SQL?

SQL stands for Structured Query Language. It is a programming language specifically designed for managing and manipulating relational databases. SQL allows users to store, retrieve, modify, and delete data from databases. It is widely used in the field of data management and is the standard language for interacting with relational database management systems (RDBMS). SQL provides a set of commands that enable users to perform various operations on databases. These operations include creating and modifying database schemas, inserting and updating data, querying the database to retrieve specific information, and defining relationships between tables.

Some common SQL commands include: SELECT: Used to retrieve data from one or more tables based on specified criteria. INSERT: Used to add new records into a table. UPDATE: Used to modify existing records in a table. DELETE: Used to remove records from a table. CREATE: Used to create a new database, table, or other database objects. ALTER: Used to modify the structure of an existing database object, such as adding or removing columns in a table. DROP: Used to delete a database, table, or other database objects. SQL is a declarative language, meaning that users specify what they want to achieve, and the database management system takes care of the implementation details. It is widely supported by various database systems, including Oracle, MySQL, Microsoft SQL Server, PostgreSQL, and SQLite, among others.